@ #45 | fix mysqlha backup with xtrabackup 8

[datphan]

we're missing these options so it did not works
https://docs.percona.com/percona-xtrabackup/8.0/privileges.html#other-connection-options

[hoatle]

@datphan please check 2 tests below:

1. With default values (mysql:5.7.36 and teracy/xtrabackup:2.4)

$ kubectl create ns test
$ cd charts
$ helm upgrade --install db mysqlha -n=test

Expected: 3 db pods (replicas) should run normally
Actual: It's not

2. With override values (mysql:8.0.27 and teracy/xtrabackup:buster-8.0):

$ kubectl create ns test
$ cd charts
$ helm upgrade --install db2 mysqlha --set mysqlImage=mysql:8.0.27 --set xtraBackupImage=teracy/xtrabackup:buster-8.0  --n=test

Expected: 3 db pods (replicas) should run normally
Actual: It's not

3. And make sure that CI build is passed.

[hoatle]

@datphan pls check my comment above.